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Deciphering RNA G-quadruplex function during the early steps of HIV-1 infection.

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G-quadruplexes (G4s) form in the HIV-1 genome and inhibit viral replication. Stabilizing these G4 structures early in infection blocks reverse transcription, offering a potential therapeutic strategy.

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Area of Science:

  • Molecular Biology
  • Virology
  • Structural Biology

Background:

  • G-quadruplexes (G4s) are non-canonical nucleic acid structures crucial in various biological processes.
  • Understanding G4 formation and function during viral infections is vital for developing novel antiviral strategies.

Purpose of the Study:

  • To investigate the formation and functional significance of G-quadruplexes within the HIV-1 genome during infection.
  • To explore the potential of G4-targeting compounds as antiviral agents against HIV-1.

Main Methods:

  • Bioinformatic and biophysical analyses to identify conserved G4 sequences in the HIV-1 genome.
  • Utilized porphyrin-based G4-binders to assess G4 formation and its impact on HIV-1 infectivity in human cells.
  • Employed qRT-PCR and G4-RNA pull-down assays for temporal and molecular characterization of viral G4s.

Main Results:

  • Identified 10 conserved G4-forming sequences in HIV-1, exceeding the conservation of known regulatory elements.
  • Porphyrin-based G4-binders significantly inhibited HIV-1 infectivity by preventing reverse transcription initiation.
  • Viral G4s form within the first 2 hours post-infection and contain critical regulatory elements like PPT, cPPT, and U3 regions.

Conclusions:

  • G-quadruplexes are integral to early HIV-1 replication, particularly during RNA processing for reverse transcription.
  • Targeting viral G4 structures with specific binders presents a promising therapeutic avenue for HIV-1 infection.